Wrapping die



June `17, 1947.

M. GREENBAUM 2,422,408

, WRAPPING DIE Filed Oct. l2, 1944 2 Sheets-Sheet 1 INVENTOR jfwfZz-f; @Zadar/14 Juni-317, 947. M. GREENBAUM f I 21,422,408

WRAPPING DIE Filed Ooi. l2, 1944 2 Sheets-Sheet 2 y Z3 @a W Patented June 17, 1947 WRArPmG DIE Martm-oeenbaum; Newark, Ns' J.; assigner of" one-halflto Charles-Handler;NWark;N2 `J Applicatinfoctober r12, 1944, Serial. No..f'5'58,4,73 5

SfCIaims: v1

This invention relates, generally,..toA apparatus for.. wrapping. objectsin protective. enclosures; and fthe ,invention has .reference,.v more .particularly, to asemi-automatic mechanism.y operative to apply exible wrappingfmaterialabut an lob'- ject desiredA tobe protectively enclosed therein..

The 1V invention .has for.. an .object to: provid@ a. nove1.-mechanismv designedy to= facilitate .the ape-- plication .of exiblefwrapping. material. to andi abouttan'objectv to beprotectivelyenclosed therein, said mechanism includinga novel .wrapping die-throughr AiIhichf-.maybeipassed. the object to be `wrapped .together-with the jwrappingematerial whereby :not only ,to-f fold said :materiaiaboutthe .object butto closely and.v snugly fltfthe materialV to saidobjectz.- n

Another object ofethe inventionis toprovide in.A combination with.. a` supported..` wrapping, die, throughwhich. an object and-.wrapping material desired to bef applied thereto-may be passed, mechanical means for-applyingfthrustingf.force to the object and wrapping material whereby to .operatively pass -the latter throughl the die;

IThe invention. 'has y:for a further object :to provide. aknovel wrapping die havingf an .f aperture thl'Ough'Which' the object to be lwrapped and .the Wrappingmaterialfmayiioe passed, said aperture being bounded by tensionallyfyieldable. means: adapted :to lexert anV elastic constrictive..pressure. uponvv the wrapping material, i wherebyA toboth. iold'the latter labout ithe obj ectY andratethe same time draw and ironaoutwthe*wrapping material. into snugandtight -tting -relation .tofthe lsurfaces f of the object.

Othery objects of thisinvention; not atthis time more` particularly, enumerated, will?. be Y understood-z from the .following :detailed:4 description. of the samer t Illustrative embodiments offthis invention areA shownI in" the accompanying drawingsf in. which:

Fig. 1 isa side elevational view-of,.wrappingap-y paratus: -made 'according .to this invention;v .Fig.- 2 is a topplanviewf of .thefwrappingidie of saidfap paratu's, drawn on a. somewhat venlargedtfscale; Fig.;" 3 -is a .transverse Vertical isectional-.view through the .wrapping--dieeof Fig; 2';` andFig. 4 is anA enlarged.` .fragmentary `View shown'ggone: formT of-joint-for joining-theends Of-ia=.fspiral spring-v body wherebygto form' .fromftheflatter theztensionally.; yieldable fconstrictive'.'pressureslexerting member of: the wrapping die.;`

Figs.- 5' andl `6. are fragmentary ,.views iin' -part section l. illustrating` stages of the.: operations whereby aicylindricalf object==andwrapping; mate,- rial'` ltherefor'. i are passed f througrli-fftlner Wrappingviv die for 1applicationf.ofv z said wrapping :material to said-object;

Figs." 7,. 8 anda-9 arefsimilar fragmentary-.views A in- .part i sectionvillustratingfxstages of= the -zoperaeeg tions whereby; a-t-vhollow-f cylindrical@ object and...

wrappingjmaterial.. therefor are` passed:v through the .wrappingdie for application .of said 'wrapping material to' said hollow 0bje`ct.`

Fig'. 10i is a plan view of a modiedform'of the novel wrapping die of 'this invention.

Si'r'nil'ary characters of `reference are employed in rtheihereinabove described views'to indicate correspondingparts".

Referring` to the drawings; the reference char-E acter 'I I indicates .aitable,. bench top or similar work; place in connection with which thenovel Wrappingjapparatus of., this invention'is arranged; Said table or benchtop, Il is provided with an opening L12 ofv suitable dimensions. liixedon the table orbenchl' top H is van' apertured wrapping When the wrapping die is designed for the re'- ceptionoi cylindrical objects, said aperturel I is" l of circular shape and of somewhat larger diameter I than that-'of the cylindrical object desired to be passed therethrough' for Vapplication. tothe object offprotective Wrapping material. Indent-A ing the Lside's' .of said` aperture I /iis an 'internal-x annular channelll 5jM Seated in'theannular chan# nel llgsoas tobe embraced and held againstyer-'l tical .displacement by the walls thereof, is' aten.-VV sionally and radially yieldable elasticdiefrng .15"

comprising a spiral 'spring annulus, the'internal diameterof which is normally somewhat lessthan the diameter-jv of the cylindricalY object. to i be wrapped," and lconsequently the internal peripheral. portions of said spring annulus projectinto theaperture I4 "of the die body l'fr'eely'beyond the .mouth margins of 'said annula'rchannel` 15,".

withinthe interiorof which channel |5-the external.. peripheral "portion Vofthe spring 'annulus is lodged. Said spiral Vspring annulusv is formed from a suitable length. of metallic spiral'spring whichis wrought into a continuous. circular shapeby suit-'- ab1y..joining .itsmee'ting -end portions. One' satisfactory method-lof joining the'meeti'ng' end 'por'- tions of. thefspringfis-shownin Fig. 4,'and cornprisesthe:provisionfat 'one end.th`ereof,`of a cou# pling..,portion I6. of reduced'diameter, which is adapted-to be screwed.v into the opposite'V open end f portionv of the. spring, thus coupling' the meeting `ends ofthe latter together in suchmannerthatthecross-sectionaldiameter of the resultingspring annulus is uniform throughout .its circular. extent. Extendingv from the internal "ani nularechannel-l to the external periphery ofthe die .bodyfl3 are a plralityof equi-spaced radial.

passages .11. Within these passagesare a'se'ries of .f compression.. springs I8, the outer' ends of" whichf are backed by stop. plugs Al 9; the latter 'bel I3. These compression springs I8 exert inward yieldable thrust upon the die ring I6 at spaced points around its circumference, thus functioning to maintain said die ring centered in axial alignment with the die body aperture I4, and yet free to contract and expand in performance of Va wrapping operation.

Suitable mechanism is provided for applying axially directed thrusting force to the object and wrapping material desired to be passed through the wrapping disc. An illustrative formof such mechanism, as shown, comprises a vertically reciprocable shaft 20 passes slldably mounted in guide members 2| which are affixed to the table or bench top II, in such manner that said shaft 20 perpendicularly through said table or bench from the underside thereof for projection upwardly above the same. Said shaft is provided with a spline 22 or equivalent means which cooperates witha key pin 23 so as to retain the shaft, against rotation while nevertheless free for vertical reciprocatory sliding movement. Afxed to the lower portion of said shaft 20 is a stop collar 24, which by abutment upon the guide means limits the upward sliding movement of the shaft. The shaft 20 is normally but yieldably held in up-slid position, as limited by said stop collar. To this end, the lower portion of the shaft 20 has -aixed thereto a cross-head 25 to the extremities of which are connected pull springs 26, the upper ends of which are suitably anchored to the underside of the table or bench top II, as by anchoring eyes 26. Aixed to the upper end portion of said shaft 20 is a laterally extending arm 21, and to the outer end portion of said arm 2l is fixed a plunger rod '28 dependent therefrom. Said plunger rod 28 is directed toward and is disposed in axial alignment with the aperture I4 of the die body I3. Afxed to the lower extremity of said plunger rod 28 is a plunger head 29, the same being equipped at its free end or under face with a body or disk 30- of flexibly resilient material, such e. g. as rubber, said body or disk 30 exceeding in diameter that of the plunger head 29, so that freely extending annular mar- L ginal portions thereof provide flexibly yieldable lip portions v3| for purposes subsequently to be described. Suitable means is provided for actuating the shaft 20 and plunger means supported therefrom, `which means, in a preferred form thereof, comprises a pivoted foot-treadle lever 32 mounted on the oorbeneath the table or bench top II. The lower end of said shaft 20 is suitably connected to said foot-treadle 32, as e. g. by a connecting link 33.

The wrapping apparatus, as thus far described, is especially adapted for service in wrapping solid or hollow cylindrical or substantially cylindrical objects. The apparatus is particularly well adapted for the wrapping of highly finished machine parts or like metallic objects for shipment or other transport, storage, etc., whereby during the period of storage or of transport and all handling preliminary to use thereof, said parts or other objects and their highly finished surfaces may be protected against exposure to the elements, corrosion, marring or other injury, especially throughout periods of marine or air transport overseas. Although any suitable kind of exible wrapping material may be employed, according to the degree and kind of protection desired to be afforded in any given case, for the protection of highly finished metallic objectsit has been found that a composite wrapping inaterial comprising an inner layer o oiled or other 4 non-absorbent paper and an outer layer of wax or paraflin impregnated textile fabric best serves the purpose, especially when the object is to be subjected to the conditions of marine or air overseas transport. A wrapping material of such ing drawings by the reference character W.

lll

In the use and operation of the wrapping v`apparatus of .this invention, when employed e. g.

for the wrapping of a solid cylindrical or substantially cylindrical object, the following -procedure is carried out.. A sheet of wrapping material-W, preferably of circular form and of suitable predetermined diametrical size, is laid upon the top of the die body I3 so as to be centered over the Vdie body aperture I4. The'solid cylindrical object O is then imposed over the wrapping sheet W so as to be substantially aligned between the raised plunger head 29 and said die bodyaperture I4 (see Fig. 1). When the wrapping sheet W and object O` have been thus disposed, the

operator swings down the foot-treadle 32, thus effecting a down-sliding movement of the shaft 2B and its arm 21, and thereby imparting a downthrusting movement to the plunger head 29. The downwardly moved plunger head 29 engages the upper end of the object O and thereby pushes the latter downwardly through the die body aperture I4, carrying therewith' the wrapping material W. As the object and wrapping material move into and through the embrace of the spiral spring annulus or die ring I6, the latter will expandingly yieldrto such movement and Yetwill exert constrictive pressure thereupon which operates to draw the wrapping material upwardly around and against the sides of the object so as to press the same into snug and tight fitting relation thereto. Th'e wrapping material is sized to embrace the lower partv of the object O through a major portion of the total length of said object (see Fig. 5). Preferably either theY inner face of the wrapping material W orV the surfaces of the object is coated with a substance of adhesive efimposes it over said wrapping material and die body, and by repetition of the above described opferations, applies the wrapping material W to the opposite end portion of the object Of, so that the second sheet of wrapping material W will lap the first applied sheet thereof (see Fig. 6). When the thus fully wrapped Vobject is ejected from the under side of the die body it is received-by the operator, and laid aside for packing or other disposal. If desired, the thus wrapped article may be dipped in melted waxor paraffin, so as to be enclosed in an integral covering thereof. Y

The procedure followedV when using the Yapparatus of this invention for wrapping hollow cylindrical objects,rsuch e. g. as engine pistons,

comprises applying .the wrapping material W overvr the die body I3 and then superposing a hollow cylindrical object O', hollow end downward, over 1 the wrapping material in substantially axially aligned relation to die body aperture I4, there; upon actuating the plunger headY 29 to thrust the object O' and accompanying wrapping ma-'f` terial W through the spiral spring annulus'orA die ring I6, thus effecting an initial Wrapping of the hollow end part of said object O (see Fig. 7). The operator after receiving the thus initially wrapped object O" from the underside of the die body, applies a second sheet of wrapping material W over the die body, and then inverts the object O', hollow end upward, for disposition over the die b-ody and applied wrapping material, ready to again induce an operative downward stroke of the plunger head 29. The plunger head 29 and its flexible bottom disk 30 is sized to enter the hollow interior of the object O. On the initial descent of the plunger head 29, the same will rst enter the hollow interior of the object O', carrying with it the initially applied wrapping material W, which due to yielding or slipping of adhesive coating, slides over the surfaces of the object O', thereby entering said wrapping material W into lining relation to the interior surfaces of the object O (see Fig. 8). During this phase of the operation, the exible lip portions 3l of the bottom disk 30 of the plunger head will yield and thus exert a tensionally wiping effect upon the portions of the Wrapping material W contacted thereby, whereby to iron the latter snugly and adherently to the internal surfaces of the object O. Continued downward movement of the plunger head 29 will thereafter move the object O' again through the spiral spring annulus or die ring I5 of the wrapping die, thereby applying the same to the remaining uncovered external surfaces of said object O', and in such manner as to suitably lap the applied members W and W' of the wrapping material (see Fig. 9).

While the wrapping die, in the circular form thereof previously described, is adapted for the wrapping of cylindrical or substantially cylindrical objects, the Wrapping die may be shaped to accommodate objects of square or other polygonal cross-sectional shape. An illustrative wrapping die modified to accommodate objects of square or rectangular cross-sectional shape is shown in Fig. 1'0, and comprises a die Abody 40 having a central rectangular aperture 4l of desired dimensions, the sides of which are indented by interconnecting ohannel sections 42 opening into said aperture. Arranged within the embrace of the channel sections 42 is an elastic or yieldable die ring formed by a connected series of spiral spring sections 43, the interior side portions of which project into the die body aperture 4|. Within the channel sections 42 to extend along the die ring spring sections 43 are thrust plates 44. Extending from each channel Section 42 outwardly to the external periphery of the die body `4t are passages 45. Within each passage 45 is a compression spring 46, the outer ends of which are backed by stop plugs 4l which are threaded into the outer end portions of said passages 45. Said compression springs yieldably centralize the die ring in the die body aperture, and the thrust thereof is applied equally to the respective spring sections 43, substantially throughout the lengths of the latter, by the intervening thrust plates 44. It will be understood, that when an object to be wrapped is passed with suitable wrapping material through the die body aperture and past the spring sections 43, the latter will function to draw and iron out the wrapping material into covering engagement with the object, any forming corner folds of the Wrapping material being manually folded against the object by the operator during the progress of the object and wrap- -ping material through the wrapping die.

Having now described my invention, what I claim is:

1. In apparatus for the purposes described, a wrapping die comprising an apertured die body of substantial thickness through which wrapping material together with a superimposed object to be wrapped therein may be passed, said aperture being bounded by tensionally yieldable die means adapted to exert elastic constrictive pressure upon the object moved therethrough, whereby to draw and iron out the accompanying wrapping material into snug covering relation to the latter, and compression spring means housed in the die body outwardly of said die means operative to yieldab-ly exert inward thrust upon the latter to normally center the same relative and conformably to the die body aperture.

2. In apparatus for the purposes described, a wrapping die comprising an apertured die body of substantial thickness through which wrapping material together with a superimposed object to be wrapped therein may be passed, the wall of said die body aperture having an indenting channel coextensive therewith, an elastic die ring formed by a continuous spiral spring body housed in said channel with its internal peripheral portions projecting into and bounding said die body aperture, said die ring being adapted to exert elastic constrictive pressure upon the object moved therethrough, whereby to draw and iron out the accompanying wrapping material into snug covering relation to the latter, and equi-spaced compression spring members housed in the die body outwardly of and radially t0 said die ring operative to yieldably exert inward thrust upon the latter to normally center the same relative and conformably to the die body aperture.

3. In apparatus for the purposes described, a wrapping die comprising an apertured die body of substantial thickness through which wrapping material together with a superimposed object to be wrapped therein may be passed, the wall of said die body aperture having an indenting channel coextensive therewith, an elastic die ring formed by a continuous spiral spring body housed in said channel with its internal peripheral portions projecting into and bounding said die body aperture, said channel being of substantial depth with its bottom spaced away from the external circumferential periphery of the die ring, said die ring being adapted to eXert elastic constrictive pressure upon the object moved therethrough, whereby to draw and iron out the accompanying wrapping material into snug covering relation to the latter, and equi-spaced compression spring members housed in the die body outwardly of and radially to said die ring operative to yieldably exert inward thrust upon the latter to normally center the same relative and conformably to the die body aperture.

MARTIN GREENBAUM.

REFERENCES CITED The following references are of record in the le oi this patent:

UNITED STATES PATENTS Number Name Date 2,076,906 MacCordy Apr. 13, 1937 2,297,432 Rasch et al Sept. 29, 1942 2,241,942 Berch May 13, 1941 

